Baetis fluminum, Pictet, 1843

Sartori, Michel & Bauernfeind, Ernst, 2020, Mayfly types and additional material (Insecta: Ephemeroptera) examined by F. - J. Pictet and A. - E. Pictet, housed in the Museums of Natural History of Geneva and Vienna, Revue suisse de Zoologie 127 (2), pp. 315-339 : 320

Baetis fluminum F.-J. Pictet, 1843

Baetis fluminum F.-J. Pictet, 1843 -1845: 164-166, pl. 16-19.

Heptagenia fluminum . – Eaton, 1871: 146 (transfer).

Ecdyurus fluminum . – Eaton, 1888: 289 (transfer).

Ecdyonurus fluminum . – Ulmer, 1920b: 136 (transfer).

Ecdyonurus dispar ( Curtis, 1834) . – Thomas, 1968b: 52 (synonymization).

Accepted name: Ecdyonurus (Ecdyonurus) dispar ( Curtis, 1834) .

Locus typicus: “… le Rhône, tant dans les environs de Genève qu’à l’autre extrémité du lac”.

Type material: Syntypes (male and female imagines and subimagines), not traced. No original material of B. fluminum remains in the MHNG.

Remarks: Eaton (1871) already mentioned that only subimagines were present in the collection, but none could be found during our study. The status of this species was enigmatic for a long time until Thomas (1968b) clarified it and suggested that the concept of E. fluminum had been applied differently among the mayfly taxonomists of the first half of the 20th century. Thomas (1968b) convincingly demonstrated that F.-J. Pictet’s concept of E. fluminum corresponds to that of E. dispar Curtis, 1834 .